Erik Eckstein 43e8b07e3f GlobalOpt: improvements for constant folding global variables ...

* Simplified the logic for creating static initializers and constant folding for global variables: instead of creating a getter function, directly inline the constant value into the use-sites.
* Wired up the constant folder in GlobalOpt, so that a chains for global variables can be propagated, e.g.

  let a = 1
  let b = a + 10
  let c = b + 5

* Fixed a problem where we didn't create a static initializer if a global is not used in the same module. E.g. a public let variable.
* Simplified the code in general.

rdar://problem/31515927

2020-02-26 17:35:05 +01:00

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